q-line for subcooled liquid

Figure 2: Examples of q-line slopes The q-line (depicted in blue in Figure 1) starts at the x = y line and intersects the starting point of the rectifying section operating line. The parameter q is the mole fraction of liquid in the feed, and the slope of the q-line is q / (q - 1).

The term subcooling refers to a liquid existing at a temperature below its normal boiling point. For example, water normally boils at 100°C (at atmospheric pressure); at room temperature 20°C the water is termed "subcooled". Analogically the subcooling is defined also in nuclear engineering but for another purpose.

Note that qcan be less than zero (superheated vapor) or greater than unity (subcooled liquid). The slope of the q-line is q/(q - 1). The construction of the two operating lines and the q-line is performed in Excel as follows: 1. The rectifying-section operating line is drawn using Eqs. 1 and 2 and the specifi ed values of x D and R.

If the feed is a mixture if liquid and vapor, "q" is the fraction that is liquid, i.e. q = 1-y, where y is molar fraction of vapor phase in the 

Boiling a liquid with Xa of 0.2 produces a vapour with Ya of 0.57 Subcooled liquid q > 1 q line /; Bubble point liquid q = 1 q line |; Partially 

Equation 7 is the equation of the operating line for the stripping section. The feed type is characterized by using a factor q, defined as the number of moles of liquid flow in the stripping

Oct 03,  · Adding the material balance (Q-line) to the y-x diagram

If the feed is a vapor— liquid mixture, q is a fraction. Values of q greater than 1 indicate subcooled liquid feed. Values of q less than 0 indicate superheated vapor feed. Now let us look at the intersection points (x„ y,) of the stripping and rectifying operating lines. Use of equations (2.28) and (2.30) gives:

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At x=0.5 another small line is drawn that represents the feed or `q' line. subcooled liquid the slope of the feed line is even positive, the same for a 

Feed quality q: q < 0 is superheated vapor; q = 0 is dew point vapor; 0 < q < 1 is a liquid vapor mixture; q = 1 is bubble point liquid; q > 1 is a subcooled